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One map gripe I have: They have markings for "steep hills", but don't place them in the places with steep hills. Let's get a draft from the city next time they do an update and plan a day or two to ride all the roads so we can help them properly identify the hills.

For example: Braddock Rd going west right after Russel Rd isn't marked as a steep hill--but that hill is ridiculously steep, and in the 2015 version of the map it is properly marked as such. And the part of Braddock they do mark as steep I'm not sure isn't nearly as hilly as the section they failed to mark. The small hill right outside my place on Valley Drive between Holmes and Gunston is considered steep on this year's map, while the rest of Valley Drive isn't, even though there are sections of it that are much worse than the area outside of my place (once again, it was marked correctly as all being hilly on the 2015 map...). And don't even get me started on Martha Custis, which is a giant steep hill, and isn't marked as such on this year's map.

One map gripe I have: They have markings for "steep hills", but don't place them in the places with steep hills. Let's get a draft from the city next time they do an update and plan a day or two to ride all the roads so we can help them properly identify the hills...And don't even get me started on Martha Custis, which is a giant steep hill, and isn't marked as such on this year's map.

Martha Custis isn't marked? That hill is what convinced me to trade in the 12-23 cassette on my new 1993 Bridgestone RB-1 from Spokes Etc. It's been a steep hill for decades and ain't getting flatter.

One map gripe I have: They have markings for "steep hills", but don't place them in the places with steep hills. Let's get a draft from the city next time they do an update and plan a day or two to ride all the roads so we can help them properly identify the hills.

Good idea. Lots of input had been provided to City staff, but some of the input was lost in all of the staff transition that has taken place in the last year. I was surprised by how much was dropped from this map. There are enough errors on the map that maybe a revision will be in the cards.

The City's GIS division has data on both topography (e.g., https://www.alexandriava.gov/uploade...graphy2014.pdf) and roadways - shouldn't this be a straightforward matter of deciding what grade percentage qualifies as steep and then relying on the data rather than volunteer feedback? It seems crazy to me as I review old versions that, for instance, Kennedy/Landover aren't marked as steep.

The City's GIS division has data on both topography (e.g., https://www.alexandriava.gov/uploade...graphy2014.pdf) and roadways - shouldn't this be a straightforward matter of deciding what grade percentage qualifies as steep and then relying on the data rather than volunteer feedback? It seems crazy to me as I review old versions that, for instance, Kennedy/Landover aren't marked as steep.

In general that data just doesn't work that well for determining how steep a short segment is.

In general that data just doesn't work that well for determining how steep a short segment is.

Surely that depends on the resolution of the topo data. If you had, say, one foot contour lines or one square foot LIDAR/elevation data, how could you not be able to derive a really good understanding of road slope? I don't know what the resolution of City data is, but I'm pretty sure it's a *lot* better than, say, a Forest Service printed hiking map.

Surely that depends on the resolution of the topo data. If you had, say, one foot contour lines or one square foot LIDAR/elevation data, how could you not be able to derive a really good understanding of road slope?

Well, that's a big if. But sure, with perfect data you can do anything.